(19)
(11) EP 1 350 650 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
03.12.2003 Bulletin 2003/49

(43) Date of publication A2:
08.10.2003 Bulletin 2003/41

(21) Application number: 03005435.7

(22) Date of filing: 13.03.2003
(51) International Patent Classification (IPC)7: B60K 6/04
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR
Designated Extension States:
AL LT LV MK

(30) Priority: 13.03.2002 JP 2002068303

(71) Applicant: Nissan Motor Co., Ltd.
Yokohama-shi, Kanagawa 221-0023 (JP)

(72) Inventors:
  • Minagawa, Yuusuke
    Yokosuka-shi, Kanagawa 237-0063 (JP)
  • Oshidari, Toshikazu
    Yokosuka-shi, Kanagawa 237-0066 (JP)

(74) Representative: Grünecker, Kinkeldey, Stockmair & Schwanhäusser Anwaltssozietät 
Maximilianstrasse 58
80538 München
80538 München (DE)

   


(54) Shift control device for hybrid vehicle


(57) A shift control device includes a controller (10) and a differential mechanism (2) including four rotating elements. Each of the elements is connected to an engine, two motor/generators and an output.
The controller (10) is programmed to calculate a target driving power (Po*); make a judgment as to whether the target driving power (Po*) is less than or equal to a driving power (Po γ) wherein the engine is driven under optimum fuel efficiency; when the judgment shows that the target driving power (Po*) is larger than the driving power, calculate an engine's speed (Ne γ) and torque (Te γ) wherein the target driving power (Po*) is realized such that the engine is driven for maximum load; and control the engine under the engine's speed (Ne γ) and torque (Te γ).
Consequently, if the target driving power (Po*) is above what the engine alone can provide under optimum fuel efficiency, it is possible to provide the target power (Po*) without consuming an electric power of a battery.






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